Allen and Dynes.
Building on the work of McMillan, Allen and Dynes (AD) in 1975 presented a re-analysis[1]} of T\(_c\) , using more than two hundred solutions to the Eliashberg equation for \(\lambda \)  up to 10 and \(\mu ^*\)  up to 0.20, and experimental determinations of \(\alpha ^2F\)  (by numerical inversions of tunneling data) with associated measured T\(_c\) . AD chose to generalize the McMillan equation. Most obvious is that the frequency prefactor from \(\omega _2\)  (altered earlier from McMillan's \(\theta \) ) to the logarithmic moment \(\omega _{log}\)  with an adjusted constant, as the latter produced a better fit to their data.
